high rpm no movement

[partybarge341]

i have a johnson TJ60TLENE, my boat has no movement above 2000 rpm in F but works fine in R , i'm able to place the gear shifter in any gear except for N and hand turn the prop , and it will turn the engine . could i do this if it had a spun prop ? hope this is clear enough

 

[Boss Hawg]

Re: high rpm no movement

it's me again, i have a johnson TJ60TLENE been working great today i was going across the lake reved up and the boat slowed down back off the throttle and started again engine reved no movement increased throttle to 2000 boat moved any increase in throttle stops again powerhead runs fine has F&R pulled boat boat out of water no sign of prop damage acts like a slipping clutch any help would greatly apprecaited

Tryed to read this a couple times but gave up
I can't spell pronutuation but you need to use it

 

[jt185]

Re: high rpm no movement

Punctuation would help.

 

[kenmyfam]

Re: high rpm no movement

If I understand correctly it sounds like you have a spun prop.
You can do a search for some of the many threads that discuss it and how to check for it.

 

[kenmyfam]

Re: high rpm no movement

Here's a link for you.

http://forums.iboats.com/showthread.php?t=351608&highlight=spun+prop

 

[tashasdaddy]

Re: high rpm no movement

agree ^^^

 

[bonzoscott]

Re: high rpm no movement

I have what I have often thought the same problem with my 4.3 liter stern drive. I bought new in '90 and would do 55 mph. Now it may reach 40 at 4500 rpm. But I ask you folks this: Why after yrs, 100s of hours of hard towing tubes and skiers, why does that prop eventually not spin freely???

 

[kenmyfam]

Re: high rpm no movement

I have what I have often thought the same problem with my 4.3 liter stern drive. I bought new in '90 and would do 55 mph. Now it may reach 40 at 4500 rpm. But I ask you folks this: Why after yrs, 100s of hours of hard towing tubes and skiers, why does that prop eventually not spin freely???

It's not the prop spinning freely it's the hub to prop connection. The drive shaft spins faster than it can turn the prop because the hub has lost it's bond to the prop itself. In this case the motor will still rev as high as usual but the prop does not spin at that RPM due to the slippage.
There are many other reasons why your boat may go slower that should be investigated as well though. What was your original max RPM when it would do 55 mph ??

 

[tashasdaddy]

Re: high rpm no movement

bonzoscott, yours is an I/O question, not outboard. http://forums.iboats.com/forumdisplay.php?f=21